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Boyle's Law.

abscissae V VI corresponding volumes, a temperature t being
maintained. Only one curve, the rectangular hyperbola, has
ordiriate x abscissa constant throughout, and that is the form
of the curve AB, Although always approaching the co-ordinates
oc, OD, it only meets them at infinity.

Isothermals.óBy reason of equality of temperature, AB is
also known as the isothermal of a perfect gas, that Is, of a gas
following Boyle's law perfectly. Marriotte's tubes, Pig. 600,
prove fairly well the accuracy of this law* A Is a closed aa<i a